/usr/share/doc/racket/unstable-find/blueboxes.rktd is in racket-doc 6.1-4.
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((3) 0 () 1 ((q lib "unstable/find.rkt")) () (h ! (equal) ((c def c (c (? . 0) q find-first)) q (470 . 11)) ((c def c (c (? . 0) q find)) q (0 . 11))))
procedure
(find pred
x
[#:stop-on-found? stop-on-found?
#:stop stop
#:get-children get-children]) -> list?
pred : (-> any/c any/c)
x : any/c
stop-on-found? : any/c = #f
stop : (or/c #f (-> any/c any/c)) = #f
get-children : (or/c #f (-> any/c (or/c #f list?))) = #f
procedure
(find-first pred
x
[#:stop stop
#:get-children get-children
#:default default]) -> any/c
pred : (-> any/c any/c)
x : any/c
stop : (or/c #f (-> any/c any/c)) = #f
get-children : (or/c #f (-> any/c (or/c #f list?))) = #f
default : any/c = (lambda () (error ....))
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